Set Cell in GtkTreeView to edit mode programmatically - c++

Question

I currently write an application that has a GtkTreeView with a GtkCellRendererText which property editable is set to true. When double clicking an item, I can edit it. Now I want to be able to add an empty row and immediately start editing it. I tried using gtk_tree_view_set_cursor_on_cell with start_editing set to true. It selects the row, but it does not start editing. I put together a small example (please not that I do not have any error checking in place as its just a small example).
#include <gtk/gtk.h>
GtkListStore *store;
GtkWidget *window;
GtkWidget *view;
GtkCellRenderer *renderer;
GtkWidget *button;
GtkWidget *vbox;
void sig_inserted(GtkTreeModel *model, GtkTreePath *path, GtkTreeIter *iter)
{
// Set cursor on cell with start_editing = TRUE
gtk_tree_view_set_cursor_on_cell(GTK_TREE_VIEW(view), path, gtk_tree_view_get_column(GTK_TREE_VIEW(view), 0), renderer, TRUE);
}
void button_clicked(GtkButton *button, GdkEvent *event, gpointer user_data)
{
// Add empty row to liststore
GtkTreeIter iter;
gtk_list_store_append(store, &iter);
gtk_list_store_set(store, &iter, 0, "", -1);
}
int main (int argc, char **argv)
{
gtk_init (&argc, &argv);
window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
g_signal_connect (window, "delete_event", gtk_main_quit, NULL);
view = gtk_tree_view_new ();
// Create renderer and set editable to TRUE
renderer = gtk_cell_renderer_text_new ();
GValue val = G_VALUE_INIT;
g_value_init(&val, G_TYPE_BOOLEAN);
g_value_set_boolean(&val, TRUE);
g_object_set_property(G_OBJECT(renderer), "editable", &val);
g_value_unset(&val);
// Insert Text column
gtk_tree_view_insert_column_with_attributes (GTK_TREE_VIEW (view),
-1,
"Name",
renderer,
"text", 0,
NULL);
store = gtk_list_store_new (1, G_TYPE_STRING);
// Add test item
GtkTreeIter iter;
gtk_list_store_append (store, &iter);
gtk_list_store_set (store, &iter,
0, "Test",
-1);
gtk_tree_view_set_model (GTK_TREE_VIEW (view), GTK_TREE_MODEL(store));
vbox = gtk_vbox_new(0,0);
button = gtk_button_new_with_label("Add edit item");
gtk_box_pack_start(GTK_BOX(vbox), view, TRUE, TRUE, 0);
gtk_box_pack_start(GTK_BOX(vbox), button, TRUE, TRUE, 0);
gtk_container_add (GTK_CONTAINER (window), vbox);
gtk_widget_show_all (window);
g_signal_connect(G_OBJECT(store), "row-inserted", G_CALLBACK(sig_inserted), NULL);
g_signal_connect(G_OBJECT(button), "button-release-event", G_CALLBACK(button_clicked), NULL);
gtk_main ();
return 0;
}
Compile it with g++ (as I do not comply with all C needs) using
g++ -o tree tree.cc `pkg-config --libs --cflags gtk+-2.0`
It would also work with Gtk3 I think as nothing seems to have changed in the things I use.
Can somebody point me out why it does not start editing?

Answer 1

gtk_list_store_set cancels editing of a cell. Commenting out this line makes everything work.
It can be found this with a little modification to code:
void sig_inserted(GtkTreeModel *model, GtkTreePath *path, GtkTreeIter *iter)
{
GtkTreeViewColumn * col = gtk_tree_view_get_column(GTK_TREE_VIEW(view), 0);
// Set cursor on cell with start_editing = TRUE
g_message ("sig_inserted", __LINE__);
gtk_tree_view_set_cursor_on_cell(GTK_TREE_VIEW(view), path, col, renderer, TRUE);
}
void button_clicked(GtkButton *button, GdkEvent *event, gpointer user_data)
{
// Add empty row to liststore
GtkTreeIter iter;
g_message ("Clicked");
gtk_list_store_append(store, &iter);
g_message ("Appended");
gtk_list_store_set(store, &iter, 0, "x", -1);
g_message ("Set");
}
void
estart (GtkCellRenderer *renderer,
GtkCellEditable *editable,
gchar *path,
gpointer user_data)
{
g_message ("renderer: start edit");
}
void
ecancel (GtkCellRenderer *renderer,
gpointer user_data)
{
g_message ("renderer: cancel edit");
}
And connecting to renderers signals:
g_signal_connect(G_OBJECT(renderer), "editing-started", G_CALLBACK(estart), NULL);
g_signal_connect(G_OBJECT(renderer), "editing-canceled", G_CALLBACK(ecancel), NULL);
Give the following output:
** Message: Clicked
** Message: sig_inserted
** Message: renderer: start edit
** Message: Appended
** Message: renderer: cancel edit
** Message: Set